Peakflow Forecasts Header

SF STILLAGUAMISH--AT JORDAN ROAD
   State:  Washington    County:  SNOHOMISH
   Latitude:  48 5' 43" North    Longitude:  121 58' 27" West
   Elevation:  195 feet
   Supporting WFO:  Seattle    
   Action Stage:  210'   Flood Stage:  211'   Moderate Flood Stage:  212.5'
   Major Flood Stage:  213.5'

Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks.

SF STILLAGUAMISH--AT JORDAN ROAD   (SSFW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-06-06
 Forecast Period: June 6 to October 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 203.99 2077 2026-06-10
90 % 203.99 2077 2026-06-10
70 % 203.99 2077 2026-06-10
50 % 204.58 2901 2026-07-20
30 % 205.43 4309 2026-09-16
10 % 206.57 6937 2026-09-28
05 % 208.19 11492 2026-09-30

Peakflow exceedence plot for SSFW1

 Click to download runoff traces used in forecast.  Click for comma delimited data used in plot.csv icon